GLOSSARY

Asteroids
Bodies of rock, metal ore and some ice covered in Craters
Most Asteroids orbit the Sun in the area between Mars and Jupiter -Asteroid Belt


Atmosphere
The gases surrounding a space object - the atmosphere surrounding Earth


Comets
Mixture of ice and dust left over from the Solar Systems' formation


Craters
A hole or depression formed on impact with a smaller object


Diameter
The distance of a line from one side of a sphere to the opposite side
that passes through the centre
Orbit
The path a satellite takes around a celestial body